https://sourceware.org/bugzilla/show_bug.cgi?id=22626
Bug ID: 22626
Summary: [bisected] ld -pie produces invalid relocations on
powerpc-unknown-linux-gnu-gcc
Product: binutils
Version: 2.30 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: slyfox at inbox dot ru
Target Milestone: ---
Original bug:
https://bugs.gentoo.org/641474#c4
The issue manifests as non-working binary when gcc is built with
--enable-default-pie.
$ powerpc-unknown-linux-gnu-gcc a.c -o a
/usr/libexec/gcc/powerpc-unknown-linux-gnu/ld: warning: creating a DT_TEXTREL
in a shared object.
$ ./a
Segmentation fault
$ readelf -a a
Relocation section '.rela.dyn' at offset 0x2a0 contains 33 entries:
Offset Info Type Sym.Value Sym. Name + Addend
...
000004e2 00000906 R_PPC_ADDR16_HA readelf: Error: bad symbol index: 00000009
in reloc
000004ea 00000904 R_PPC_ADDR16_LO readelf: Error: bad symbol index: 00000009
in reloc
00000512 00000906 R_PPC_ADDR16_HA readelf: Error: bad symbol index: 00000009
in reloc
0000051a 00000904 R_PPC_ADDR16_LO readelf: Error: bad symbol index: 00000009
in reloc
It looks like .rela.dyn refer to already garbage-collected symbols.
I've bisected it down to the following commit:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff;h=6b3b0ab89663306d17927d630304dbbd36e84570
"""Linker assigned symbols should be made dynamic by default only when
creating shared object or relocatable executable."""
Last working: 2.26.1
Tested broken: 2.27, 2.28.1
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